FBI are 'probing whether Rudy Giuliani broke law by getting US ambassador to Ukraine Marie Yovanovitch fired in exchange for information on the Bidens'
Investigators are said to be trying to determine if Giuliani was acting on behalf of Ukrainian officials when he pushed for Yovanovitch's ousting
Lobbying the US government on behalf of foreigners without registering with the Justice Department is a crime
Yovanovitch was abruptly fired by Donald Trump in May 2019 following what she and many others said was a smear campaign orchestrated by Giuliani
Trump's then-personal attorney wanted her out of the picture because she refused to help dig up dirt on Joe and Hunter Biden in Ukraine